Return after emitting error in tty.js

lib/tty.js

@@ -102,6 +102,7 @@ WriteStream.prototype._refreshSize = function() {
   var winSize = this._handle.getWindowSize();
   if (!winSize) {
     this.emit('error', errnoException(errno, 'getWindowSize'));
+    return;
   }
   var newCols = winSize[0];
   var newRows = winSize[1];